Automatic regulating mechanism for secondary combustion.



P; E. BROWN. AUTOMATIC RBGULATING MBGHANISM Fon SECONDARY OOMBUS'HON,

APPLICATION FILED OOT.4,1907

Patented Dec. 1, 1908 2 sanne-anim' 1 P. H. BROWN. AUTOMATIU REGULAIING MEGHANISM FOR SECONDARY GOMBUSTION.

APPLIGATION FILED GOTA, 19D?.

Patentad Dec. 1, 1908.

2 SHEETS-SHEET 2.

o T ww. Y WW k Y MY www m w m wm ride means for heatin UNITED STATES PATENT OFFICE..

FRANGIS H. BROWN, OF PHILADELPHIA, PENNSYLVANIA.

Speccation o! Letters Patent.

Patented Dec. 1, 1908.

@pacman una october 4, 19m. serio m. aimais.

l To all whom it may concern:

Be it vknown that I, Faanoie H. citizen of the United States, residing city and county of Philadelphia, btate of Pennsylvania, have invented a new and use ful Automatic Regulating Mechanism for Secondary Combustion, of which the following is a Specification.

()ne oi' the main object of my preaent invention is to devine a regulating mechanism for Secondary conibustion wherein the voliume ot' air delivered above the fire for secondary conibuhtion varies simultaneously and in proportion to the volume of air delivered beneath the z@rates for com'onetion, and the volume of air delivered above the fire is `intrtn'luced at a redetermined tcmperatnre, which latter is maintained subletantially constant at all times.

Another objectJ of my invention ie to de vise a construction in which I may, if desired, introduce into the air passing into the furnace `bore the lire. steam 1n its natural or superheated condition, the passage of Said steam' from the boiler being controlled auto matically hy the change in steam presanre in the boiler.

Another object of my invention is to pro-` to a higher degree, the air passing into t e furnace above the fire, which I accomplish in the resent in stance by roviding an additiona .source of heat for t te furnace gases pass-in r through the outer conduit, or a source ot ieat, elec trical or otherwiee, in the inner conduit. The rates of combustion are com-itantljv changing and for this reaeon the volume of air which is passed into the furnace above the re mast vary in pro ortion thereto. while the temperature of tie air which is Brown, a

)e ofsnch a degree that all of the unconsinned carbon in thc furnace fasen will be vonsumed.

To the above mda` my present invention consists of a novel eonetruetion of an auto matic regulating mechanism for secondary combustion. wherein hoth the volume or amount and the tmuperature of air introduced above the tire is automatically regir lated and wherein l regulate simultaneously therewithpthe draft enterin;r beneath the ing ahoi'e the tire being controlled by an independent -soui'ce of heat` or hy passing in the i this air conduit through a portion of the furnace.

Ilt further consists ot a novel construetion of a regulator in which a portion of the -draft passing to the. grates is delieeted therefrom and caused to pass in a suitable conduit throuyh the combustion chamber or other part o'llithe 4furnace wherein it is heated to a suitable temperature, after which it passes through a conduit opening into the furnace above the fire, said last mentioned conduit. being surrounded by a larger conduit through which the furnace gases may pass under certain conditions to the chimney.

It further consists of a novel construction of a regulator in which the heat of the furnace gaaes is employed to heat the air enterinv above the fire, thtI conduit through whici said entering air pasiseI being provided with a editable thermostat or its equivalent, whereby the passage of leaid furnace gases to the chimney may be automat ically eontriialed.

It` further consists of other novel features of construction, all aa will be hereinafter fnl'r Set forth.

`or the purpose of illustrating my invention`Y T have shown in the accompanying drawings one form thereof since this em bodiinent gives satisfactory and reliable resuits in practice. although it is to be understood that the various instrnmentalities of which my invention ciausifsts can be variously arranged and organized andthat my invention i'a nut limited to the exact arrangement and organization of these instrumentalities' as herein Het forth.

Figure l represents a Ysectiomil elevation I of a furnace mowing un automatic. regulab )assed into the furnace above the fire must ing mechanism for :econdary combustion enilaidying mf.' invention. in operative relation with respect thereto. Fig. 2 represents a sectional pian 'View showing niore. clearly the manner in which the lenveral conduits communicate with the furnace. Fig. B reprteentsi a sectional plan `View showing a. modified arrangement in which the air is admitted in 'front and in rear of the fire as `tell as at one side thereof.

Similar numeralanf reference indicate l corresponding parts in the. figures. gratos, the .temperature of the draft passltcferring to the drawinga in illustrating jmy invention l have preferred to show it in conjunction aith a furnace which is provided with :in nuunimtic dnnnirr regu lutor such an it; dtn-affrihed -tnd broadly claimed in my concluding appiciztirua for combustion :1nd damour regulator to: tuiylun-cs; tiled iiprilb. littl. rit-rial No. i'ti't tti. `uint'r such :t ronstruoiion Inu; been found to give rxrrllent remite, in lrnzu'ticr.

with und n combustion chumhv-r fiv -lflcnigrnutcs thl boiler whivh hy n cttnduit f with u :fun or produt'insj tnt- 'hunirlin t nhirh hitter hun u ronduit 7 lrvflitnf to :l point' heneztth tho gratos; L', uuid conduit lining provided with zi wlw b which iu opcrutix'ely erinnern-l with the hurl l nlnfrrliy the :rune muy he nutnuzllly controlled when desired.

l0 tlesipnntvu u tininpttr in the runolie .-'ttftfflt l1` sind damper heilig connected hy menne of n suitable collie 1Q with the reg'ttluting mechanism 15% which is :reunited hy yrsrinrione in the Investire ot' the triunfo gin-ret no will he clem-ly untflerstmui from my pending application hcroinhot'ore referred to und to which rct'erenre muy hr had for detailed de scription thereof.

1l designati* :i ominit lending! t'roin tinK droit owntlnit i? tout rxtendit f into tinx ronthustion rhitnitie-i Il uri indiafntecgl :it 15in Fig, kmid ronduit living lient upon ituelt in the present infitainrt; in; iS indiruted nl 11i und passing; out through the t'nrniu'e Woll. ulthough it in to hv :unici-Stood that in tin` brot-id trotte ol my inventon it` is iinnnite rinl in what n'nnugter the ronduit 15 passes through tht` romhnstion rhulnlicr l or its urrngcinent thrreint sincc it is only ensentiul that Suid conduit will entend in @uch o manner through thc coniliuriioun '.htnnher or other part of the lurnzico that it will thereby' hcconic suitably heated in order to lient the :tir jnmsing therethrough. The conduit iti passes through the side ivull of the conduit 17 which connnnnirzttes with the furnace above tho tiro, said Conduit 17 beingr also connected with ihr brunch 1H lending to the smoke stuck 11, The conduit 1t? lifter pussing through tho sidiwnll of the conduit" 17 opens into :in innl'r ronduit 19 which is closed ut ontl ond :is indicated :it Q0 :ind its other 0nd opel through the side wall of the furnace above the gratos. it: living apparent from Figs. 1 to It tlmt this ronduit 1S) is completely inclosed hy the larger ronduit 17, so that thti heated air passing from the conduit' 1G through the conduit 19 to the turniere will ho heated hy the gases passing between Suid conduit 17 :1nd the conduit 19 to the brunch 18 :nul thereby to the stack 11.

In order that the ten'ipernture of the t'urmice gases surrounding the inner conduit 19 will he kept at a uniform or predetermined temper irc.; I provid-c in the conduit i7 u damper or valve 21 mounted on n cranlr :trui 23 to which :1 lover 24 is Secured,v said lever ifs connorted other dra! ner conduit 19 as indicated at tilt being oonnrottul with a hell erzuili lever 5 pivoted ut QG tio :i nuitzihle fixed Joint Iun? provided with n slot 27 in which 1S adjust rilily .arrurcfl one, end ot the thermostat ttl. iheoiniosite end of which tixedly secured to tht: bracket. 29 curriod in :my aitnhle nimmer bythe casing wall, itr being notcd u the thermositat 2S passes directly uouggh the ronduit It? und the @loV d end 'it thtroot', it being of course understood that i; member 26 may bc provided with any t ituhle or conventional type of stuffing box lt tltiiifctl.

in the embodiment seen in Fig'. Il, I have '-:hown :i slightly inoditicd forni ot' a device in which thi-y conduit 19 is provided with a brunch 30 which passes in rear ot the tire :and is provided with :apertures 31 through irl ich, the heated :tir muy pass to the Haine.

l :ihn provide :i ronduit 32 provided With apertures 13 therein nt the troni of the tire non, it being' noted that the @nds of these tondnitsr) and 32 are cloned in any desired :n.ninrr, .l have Shown the forni indicated n Fig. 3 for the purpose of illtmtrntingf` the manner in which the limited air n be finsued into` thc tire box,y it being' uppurent thut in thc broad Scopo of my invention it is immaterial whether this heated nir is led into the, bor: on the side thereof. or nt the front or rear thereof.

t In sonic roses it is desirable not to employ forced or inet'fhanical draft and to 'this end I employ in thc ronduit 14 n vulve .'34 which controls the atmospheric inlet 35 and the punsugc of nir troni the conduit 7 to tlul ronduit 14, whereby the conduit 14 will, if desired, Communicate with the atmosphere andthe conduit 7 with the lire.

ln Some iuetzinces, it is advantageous to employ :i connection 3G opening into the outer ronduit 17 near its point of entrance to the furnace, said connection connnnnicutingr with :i source o2 heat 37 which, in the present instance, is shown :is n Bunsen burner, although it will be apparent that in the hroad scopo of my invention` it is simply necessary to increase the temperature of the furnzire gases which are passing from the furnace through. the outer conduit 17. It is :also advantageous in some rases to emplm7 u source of heut near the point of induction of the heated nir into the furnace and for this purpose, YI have shown as indicated in Figs, 2 und 3, un electric hesiter 38 located in the inner conduit 19 near the point of entrance to the furnace, so that. the heated air pissing into the furnace will be further heatstood that this construction has been omitted troni Fig. 1 ofthe dritti-*ings for the sake of rleurness of illustration. Tty oleo tugcons in some enses to employ n` steain connection 39 which communicates with the. in-

40, said conby Said electric beaten it being under-t `whereby the pesfige of steam from. the

boiler to the conduit 19 will vary depending upon the variation in pressure of the steam in seid boiler. f

ln order to superheat the steuin passing through iheeomfluit 39, said conduit is passed through w pmtion of the furnace in nu suitable munnertue is clearly indicated in ig. 1, so that the steam will be superheeted to a desired lr-,orco before it enters the inner conduit 'llt ln order that there will, under all condilions, bc produced a suiliciently induced draft in the outer conduit 17, l rovide a bypass fi-2'. which leads to the stach) 11, said bypass infini: provided with n damper 44 which is carried hy the crank arm 23, whereby said damper 44 will be simultaneously actuated with the damper 21.

in. the by-pass 4?. l locate a blowingl mechanism which, in the present instance vloic the purpose of illustration, l have shown as u fau, actuated by a motor i6 with which connuunicates the fluid inlet conduit 47, seid cond-uit beiner provided with an actuating valve LQ to which is connected, one end of ai lever 19, the other end thereof being connected to a bell crank lever S30, ulcrumed at 51 to any suitable fixed point and provided with a lever 52 which is connected with the bell crank lever 25, although it is to be understood that my invention in its broad scope comprises e draft producing mechanism in the by-pass 43, which is controlled by the thermostat 28 and anyv of the usual or conventional types of such draft producing mechanism may be employed.

' The operation can now be readily linden stood and is as follows :The draft producing mechanism 6 is controlled, in the present instance, by the steam pressure of-the boiler und the damper 10 leading from the furnace to the smoke stack is automatically con trolled by the variation in pressure of the furnace gases, as will be clearly understood from my pendinglapplicution to which I have hereinbefore referred und to which reference may lie-hud for the detailed description und o eration thereofr The pu] of the stock 11 will cause the air missing through the conduit 7 to be drawn beneath the gratos 2, thereby providing for the necessary supily of oxygen for the com hustiou. The pu l of the steek 1 1 will also amuse the air to pass from the conduit. 7 through the conduit 14 and therefrom through the conduits 15, 16 and 19, thence into the furnace above the fire, it being noted that the conduits 15 and 1G are located within the furnace in such u manner thai lhc air will become heated as it passes 35 is in operation, of seid air being contro the air which has become hunted in the furnace in paing mund mit heiter will become further heated.; an that it will enter the furnace aboveA the fin nl! the necessary tempera-tunen? produca the requisite combustion.' y,

'Ehe temperature of the ein passing through the inner conduit' 19 will actmite the thermostat 28 and cause n-lmll will beactuated and the du s 2L and 44 will be automatically open or cloned d pending upon the temperature'o the air in the conduit 19,V so that the passage of the furnace gases through the conduit 17 to the branch 18 lending to the stack 11 will be uutomatically controlled under all conditions.

'As seen in Figs. 2 und 3, as the bell crank lever 25 is actuated, it will also exert a ull on the lever 52 thereby actuating the l1 crank lever and cause the latter to actuote the lever 49 which controls the valve 48 und valicontinuing the admission-f anni pressure through the conduit 47 to nctuate the motor 46 which controls the draft producing mechanism 45. It will thus be seen that as the dempers 21 and 4A are partially o en, in addition to the pull of the stack, t cre will be an induced draft iiLthe conduit 43 owing to the provision of the draft producing mechanism 45, whereby the furnace gases will be positively drawn through the outer conduit 17 under all conditions, so' that the temperature of the air passing through the inner conduit 19 to the*furnaee above the fire will be further changed When it is desired to .inject into the air entering the furnace above the tire, steam in its natural or superhented condition, the controlling valve `41 is opened, whereupon the supevheated steam may pass into the conduit 19, the effect of which is evident.

Willen itis desired to increase the temperature of the fur-nace grisesV passing through the outer conduit 17, I employ u source of heat 37 which communicates hy the conduit 36 with the interior of the conduit 17, Whercb the temperature of` said furnace gases tiercin may be rziised to any desired degree.

lt will be apparent that I have illustrated my novel construction of regulating mechl I on the' bell crank lever 25, so that the crank arm 23 anism as employed in conjunction with a well known tyoe of furnace, but the sume may be employed in conjunction with any of the usual or conventional types of furnace and substantially the sume beneficial results will be obtained. lt will also be apparent that l have devised a regulating mechanism wherein I may, irresperrtive of the type. of furnace employed and under the varying conditions met with in practice, poss into the furnace above the lire, a volume of air at a pre-determined tem erature, the volume led by a thermostat bij actuated hy the lciuperaiure oi.' said air and i below the grate, and automat-.io means for the volume varyuig in proporiior. lo the voiume of drzii'ly pushing; iifuioih he groten,

It Vwill be apparent that whihj in this proa. ent instanfe for oonwsnieiu'e of iliustraiom I have ahown the infinite i?" and i9 and heir adjuneis as lofnted on one side or' the furniice,.ihe Home may be iorated'af. any or aired plaeoY in proximity therein and :dill he within thorseope of my invention.. [i if;

' further to he noed that. when. it is firmo-ii in in`rolho inner eonduiii 15'), to ruining; the

heater and also a Source of heat for the furnace gases iniseing through the outer ronduit i?, hut ihese are not essential under :di conditions and, if desired, one or more of them may he omitted.

It will now he apparent that l have de rised a novel and useful consirneiion of an tomntie regulating' mechanism [or Secondary combustion Vwhich embodies ihr feainrefi oi' advantage eniimerated as deairahie in the Statement of invention and he above do seription and while i have in the present instancee shown and dci-scribed :i preferred eni hodirnent hereof which ;"irnw` iu practice satisfariory and feiinhie reanii'a, it is ii, he understood ihaf ihn suine is ausvepiihie of nuifiiration in various [mrtieuhirs Wihont depariing from. the spirit and Scope of ihe invention uaaitrieing anyoi itsolivar (ages.

it is to he understood thai while, in the present immuni-L the air entering ihe fui`4 nase ahora the lire passes; ihrougfh the inner eonduilj` ihat thi:y air may he passed ihrough bhe outer rondini und ihr. iurnare gases to ih e inner vonduii and euhainniiaily ihn mnuresuiia may he ohiained.

Haringr ihm dwrrhed my ilmnliion` .rhui T eiaini as new :lud desire to aoc-uro hy im" ters Patent. is :h-

1. in a regulating4 inerhanisui for .arrondary eonihuaiion` the ronahiimrion of :i hn

nare und 'lia grate. of dra it producingy means roniniunir-.dingl wih the iin-nner ahorn and heiow the amie, and auiomutie means for heating` the air intrmiueed ahove the grate and maintaining it ai' a predetermined iemperahire.

2. In a regulating mechanism for 'eccomi ary Combustion, the combination of a furnace and its grate, of draft produeingr means (-.omnmnioaiinu with The furnaoe above and heating the nir introduced above the grate and rmiintainingr ii'` at, a prer'leiermined temperni are, the minnie of an' inf roduced above the grate varyingproporilffuately to the `volume of air introduced heirY the grate.

ii. In a regulating xneehaiuam for secondary mnnbusion, the combination of u fur' have and its grate, o draft producing means onmnnnioaiing with the furnace above and heiow the grate, automaiic means for governiiig said draft producing means and` aniolnaie means for healing; the air introdoerd ahorn the grate and maintaining it :ai f, predetermined temperature? the volume oi ai:- inirodurrd fiz-ove the frate varying in miimiion io the rohisne oi air introdured oir the ginie. 4.-. in ii regulating merhanieni for Secondary ronihualiom the f 'oniiinatiou with the graues and Smoke :uaek of the furnace, of draft proihuing mean openingr beneath ihe gfx-aies, a ronduit leading from said meson and passing through the furnace` an inner ronduit into whieh said first romiit iiisahurgee4 and eoniniunieai'ing' with the furnace ahove Said gratos. au outer ronduit sur-V rounding said inner conduit and communiraling with the furnace ai one end and with ihe. stark at, the other end. and means actu ered hy vrariation in temperature loraied in mid inner conduit` for controlling the pas-- ,ange of furnace ganen through said outer ronduit to said Saok.

5. in a regulating niechauii-ni for wroudary rornhusiion, the eomhination Wiih the grate and Siaieli of the furnace. of draft p iodni'ingf mechanism opening beneath said f rra tema Conduit leading from said nierhauiein and paseing through the imnure, un inner ronduit into which Said first eonduil disrhargw. anni inner conduit having one end rioeed and iis: opposite end openingr info the fui-nare ahofn'e the Tire. an outer ronduitsurrounding said inner rondini and opening at one end into the furnace ahore the lire und at the otheil end rommunifuiing4 with said atalr, u thermostat' in `aid inner conduit und nieuwy aruaied h r gai-lid thermostat for vontroiiing the pas'eage of furuai'e gRSeS through said outer rondui tothe lniark.

F3. In a regulating' ineeiianiani for second ary ooinhustion, the Combination with t1 gratos and ainelr oi a furnace. of dra prodnringg mechanism opening beneath sa. gratos. u conduit leading therefrom ano panning; through the furnaee un inner conduit into whirh said rst` conduit dischargea; said inner conduit haring one end rinsed, and the other rnd communicating with the fumare ahove the grate. un ouier ronduit surrounding aaid inner ronduit and opening; into the furnace at one und :whore the. graine and at the other end communicating with he stark. a damper for said omer ronduit'` i sono und e thermostat in said inner conduit op erutiwly connected wish said damper.

-ln n yreg di., 5' l'J rates and ruft producing means opening heneuth thegrates, a conduit leading :trom said means und passing through the furnace, un

inner conduit to which said first conduit dis i charges und communicating with the l'mnace above said grutes, an outer conduit sur i rounding said inner conduit und communiexiting Wlth the furnace :it one cud and with thestuck ut the other end, means :ii-toured hy variation in temperature loc-cred in nid in ucr conduit for controiiing thc passing nl" but said furnace into which said first conduit t'lischiirges, ,said conduit communicat ing with the furnace chore the gratos, un outer conduit communicating with the fur nace above thc graces :it ouc end and surrounding snid inner conduit, said outer conduit commuinenting with seid stuck, a thermostat in said inuer conduit, and means zictuitted thereby for controlling the passage of the furnace gases through Huid outer conduit to said stack.

9. In :t regulating mechanism for secondary combustion, the combination with the v rntes and stack of the urnucmof draft pro during means opening beneath said gratos, i1 ronduit lending from said mechanism und passing through said fui-mice, an inner conduit without-Suid furnace intowhioh Said first conduit discl'iarges and opening into the furnace above .scid gratos, an outer conduit opening into the furnace above said gratos :ind surrounding said inner conduit and communicating with the stuck, a damper m said outer conduit, u thermostat in said ner conduit operatively connected therewith, an nir inlet port in seid first conduit, and n vulve controlling .seid port und the communicntion bet/Ween said draft, producing means and said first conduit. ,x

10. In n regulating mechanismfor secondary combustion, the combination with the bhiler, grate and stack of the furnace, of draft producing mechanism opening be: neiith said grate, a conduit leading from said mechanism sind passing throu lli the furnace, an inner conduit into whic said first conduit discharges, said, inner conduit opening into the furnace above the re, a cmitronubte steam comun-tion frein seid boiler pessing through the tur-nece and dist.: d? n seid iii-fier conduit, en outercoi-iduit surroui-idingsaid inner conduit und opening at one end into the furnacelubeve the lire und' ut the other end communicating with seid stuck, u thermostat. in said inner conduit, und meims actuated liy said thermostzit .for controlling the passage of furmii-e grises through thc seid outer conduit to the stm li.

li. in n rcguhiting mechanism for secommr), combustion, thc con'ibinution with the lioii'cr, grate und stack of the urnao, ot' draft producing mechanism openingv be Heath scid grate, u conduit leading from said meohiiiiisi-n nd passing through the furnace, im imiciconduit into which said lirst conduit4 discharges, seid inner conduito ching into the furnace above the fire, a

'controllable steam connection from said temperature of the furnace gases in said outer conduit.

1,2. 1n a regulating mechanism-0r secondary combustion, the combination wit-h the boiler, grate mid stack of the furnace, o

draft producing mechanism opening beneath said grate, a conduit leading from said mechanism und passing through the furnace, an inner conduit into which said first conduit discharges, seid inner conduit openin into the furnace above the lire, a contro )able steam connection from said boiler pass ing through the furnace and discharging into said inner conduit, an outer conduit sur rounding said inner` conduit and opening at one end into the furnace above the fire and at the other end colnmunicating with said stack, it thermostat in said inner conduit, means for controllingtlie' passage of furnace gases through seid outer conduit to the stach-means for .i'aryin the temperature of the f" v'nece guses in sai outer conduit, and

grote and maintaining it. et a. predetermined 'volume of air introduced -rtionately to below the temperature, the above the grate varying prop the volume of air introduced 

